对800例24小时动态心电图中检出的39例室速的分析,表明室性早搏的提前指数及易损指数对恶性室性心律失常的预测均不敏感,以室速发作前基础心率作为估计室速的严重程度也不可靠.而 Lown 氏的室早分级有实用价值,有 Lowno～Ⅱ室早者,室速发生率为1.1%,而Lown Ⅲ～Ⅳ_A 者为18.5%。严重心肌病变是发展为室速或室颤的重要因素. Analysis of 39 cases of ventricular tachyarrhythmias detected in 800 patients with 24-hour ambulatory electrocardiogram showed that both the advancement index and the vulnerability index of premature ventricular contractions were not sensitive to the prediction of malignant ventricular arrhythmias, and the baseline heart rate before the onset of VT The severity of ventricular tachycardia was also not reliable, while Lown’s early classification had practical value, with Lowno ~ Ⅱ room early, the incidence of ventricular tachycardia was 1.1%, while Lown Ⅲ ~ Ⅳ_A was 18.5%. Serious cardiomyopathy is an important factor for the development of ventricular tachycardia or ventricular fibrillation.